Here are the Power settings I had in my BIOS when I wrote this report: This slowdown effect occurs no matter which card I currently have enabled. I have both an Nvidia card and an integrated card, but I have Optimus disabled. The latency particularly affects nautilus, Chrome, and the desktop (Alt+Tab-ing, etc.). I can't spot any meaningful patterns in top or htop before or after plugging in. There are no relevant messages when I unplug. Here's the output of dmesg immediately after plugging in: e1000e 0000:00:19.0: setting latency timer to 64 This is on my Lenovo Thinkpad W520, running kernel version 3.11.0-15-generic. However, when it is a problem, I can create it 100% reliably by unplugging and plugging my laptop back in. This has been happening for months, but I only recently finally connected the dots, in part because it does not happen in all situations. When I plug in my power cable - sometimes - Ubuntu 13.10 immediately slows down in just about every way.
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